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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aead0b0d7a56379cc344304ee28488c604a6ea57a8874badae9651f654d4047' 
  AND token = 'lr/lHVplNbTRjbCZJBd1H75apH8mYhzrqT61iuPdn+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}